Turn up your sound and chemist Gerard Harbison will explain it all. The tiny white thing sitting in front of the orange water balloon contains a mere 1/60th of an ounce of triacetone triperoxide (TATP), the chosen detonator of would-be shoe bomber Richard Reid. (Note: TATP is still explosive when it's wet, so it's probably one of the reasons for the TSA's draconian rules about liquids.)
Add a 9-volt battery and KABOOM.
But there's good news.